Tibetan people believe in Lamaism. The believers must recite or chant Buddhism scriptures very often. For illiterate people, what they can do is to turn prayer wheels, with scriptures inside. Turning the prayer wheel is equivalent to chanting some scriptures and it has become routine work for Tibetan people. A lot of Tibetans keep portable prayer wheels at home. Prayer wheels are of different sizes and quality. But there is one thing in common, that is they all have scriptures inside. Followers of Yellow sect turn the wheel clockwise, while followers of Black sect turn it anticlockwise.